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Properties of Atoms
Properties of Atoms
What is the atomic no. of Ca?
20
Name the 1st element in group 1.
H
Write the electron Conf. of Mg.
1s2 2s2 2p6 3s2
Name Co group & period Average.
period 4 group 9
If n=5 p=4, find the mass no. and what element?
mass number 4, element Be
Name the 2nd element in the transition metals.
Titanium
Write the noble gas electron Conf. of Fe.
1s2 2s2 2p6 3s2 3p6 4s2 3d6
Write the electron Conf. of all halogens.
F, Cl, Br, l
If Ca-41 has 20 p., how much e- & n?
e:20 n:21
What is the family group name of Br?
Halogen
Write the noble gas electron Conf. of Se
What is the diff. between Ca & Sc? If an electron is lost, write the electron Conf. of each
One is s-block, and the other is p-block. 4s1, and the other one is also 4s1
If Cu+2 ion is given, find p= n= e=?
p=29 n=39 e=27
Element end in 3s1 is called...
Na
How many unpaired electrons are in Sulfur?
2 unpaired
How many valence e- in Ag+, Cu+, K+. Which is the most stable?
Ag+= 5s1 4d9, Cu+= 4s1, K+=3s2 3p6
It is K because it is the most filled.
If e=9 p=8, name the ion with its charge.
O-
Elements in group 17 have how many e- in p orbital?
5
Write the electron Conf. of V2+.
1s2 2s2 2p6 3s2 3p6 3d3
How do unpaired d-electrons in transition metals affect their magnetic properties?
Unpaired d-electrons result in paramagnetism, meaning transition metals can be attracted to magnetic fields. The number of unpaired electrons determines the strength of their magnetic properties.